NZQA registered unit standard
20611 version 2
Page 1 of 3
Title
Demonstrate knowledge of hydraulics and hydraulic power systems
Level
2
Credits
5
Purpose
People credited with this unit standard are able to: demonstrate
knowledge of the principles of hydraulics; demonstrate
knowledge of hydraulic power systems and applications; and
describe hazards associated with hydraulic power systems.
Classification
Mechanical Engineering > Fluid Power - Hydraulics
Available grade
Achieved
Explanatory notes
Definition
Hydraulics – industry abbreviated term for fluid mechanics or fluid power that uses a noncompressible medium such as oil or water for the conveyance of force.
Outcomes and evidence requirements
Outcome 1
Demonstrate knowledge of the principles of hydraulics.
Evidence requirements
1.1
Terminology is described in the context of a basic hydraulic system.
Range
terminology – pressure, flow, force, torque, holding pressure,
linear movement, load, lift.
1.2
Atmospheric, gauge, and absolute pressures are distinguished and their use in
hydraulic systems explained.
1.3
Pascal’s law is described in terms of how it forms the basis of hydraulics.
1.4
Basic formulas are used to calculate the performance of hydraulic systems.
Range
1.5
includes – pressure and force, with transposition of variables;
may include but is not limited to – pump displacement, hose
diameter and flow rate, cylinder volume, hydraulic cylinder speed
(both directions), kilowatts required to drive pump.
International standard units are used in calculations.
Competenz
SSB Code 101571
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
20611 version 2
Page 2 of 3
Outcome 2
Demonstrate knowledge of hydraulic power systems and applications.
Evidence requirements
2.1
The operation of a hydraulic power systems is described with the aid of a simple
system diagram sketched by the candidate.
Range
2.2
purpose of components, types of fluid medium, compressibility of
medium, contamination, precision control, difference between
open and closed circuits.
Types of equipment powered by hydraulic power systems are identified.
Range
2.3
a minimum of two types of equipment.
Types of industries where hydraulic power systems are in common use are
identified.
Range
a minimum of four different types of industries.
Outcome 3
Describe hazards associated with hydraulic power systems.
Evidence requirements
3.1
The characteristics of pressure in hydraulic power systems are described with
reference to potential hazards.
Range
3.2
motor running, motor stopped, stored energy.
Common hazards are described with reference to their potential for personal
injury.
common hazards – crushing, burns from hot oil at high pressure,
fire from oil leaks, flailing hydraulic lines, injection of oil into the
skin, oil leaks on floor.
Range
Planned review date
31 December 2015
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
25 May 2004
31 December 2014
Review
2
18 March 2011
N/A
Competenz
SSB Code 101571
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
20611 version 2
Page 3 of 3
Accreditation and Moderation Action Plan (AMAP) reference
0013
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Please note
Providers must be granted consent to assess against standards (accredited) by NZQA, or
an inter-institutional body with delegated authority for quality assurance, before they can
report credits from assessment against unit standards or deliver courses of study leading
to that assessment.
Industry Training Organisations must be granted consent to assess against standards by
NZQA before they can register credits from assessment against unit standards.
Providers and Industry Training Organisations, which have been granted consent and
which are assessing against unit standards must engage with the moderation system that
applies to those standards.
Consent requirements and an outline of the moderation system that applies to this
standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The
AMAP also includes useful information about special requirements for organisations
wishing to develop education and training programmes, such as minimum qualifications for
tutors and assessors, and special resource requirements.
Comments on this unit standard
Please contact Competenz qualifications@competenz.org.nz if you wish to suggest
changes to the content of this unit standard.
Competenz
SSB Code 101571
 New Zealand Qualifications Authority 2016